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Unsecured convertible notes (Tables)

6 Months Ended

Jun. 30, 2011

Summary of balances and terms of unsecured convertible notes

	8.00% Unsecured Convertible Notes				3.70% Unsecured Convertible Notes
	June 30,		December 31,		June 30,			December 31,
	2011		2010		2011			2010
Principal amount	$	250	$	250	$	205,877		$	301,934
Unamortized discount	17		20		2,472			6,871
Net carrying amount of liability component	$	233	$	230	$	203,405		$	295,063

Carrying amount of equity component	$	27	$	27	$	19,616		$	28,769
Number of shares on which the aggregate consideration to be delivered on conversion is determined	6,038		6,047		N/A		(1)	N/A		(1)

Issuance date	April 2009				January 2007
Stated interest rate	8.00%				3.70%
Effective interest rate	11.00%				5.96%
Conversion rate per $1,000 principal value of unsecured convertible notes, as adjusted	$41.40				$117.36

(1) Our 3.70% Unsecured Convertible Notes require that upon conversion, the entire principal amount is to be settled in cash, and any excess value above the principal amount, if applicable, is to be settled in shares of our common stock. Based on the June 30, 2011, and December 31, 2010, closing stock prices of our common stock of $77.42 and $73.26, respectively, and the conversion price of our 3.70% Unsecured Convertible Notes of $117.36 as of June 30, 2011, and December 31, 2010, the if-converted value of the notes did not exceed the principal amount as of June 30, 2011 or December 31, 2010, and accordingly, no shares of our common stock would have been issued if the notes had been settled on June 30, 2011 or December 31, 2010.

Summary of components of interest cost recognized on unsecured convertible notes

	8.00% Unsecured Convertible Notes
	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
Contractual interest	$	4	$	3,973	$	9	$	8,773
Amortization of discount on liability component	2		961		3		2,073
Total interest cost	$	6	$	4,934	$	12	$	10,846

	3.70% Unsecured Convertible Notes
	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
Contractual interest	$	1,905	$	3,558	$	3,947	$	7,117
Amortization of discount on liability component	1,115		1,964		2,532		3,898
Total interest cost	$	3,020	$	5,522	$	6,479	$	11,015